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UMOUNT(8)		  BSD System Manager's Manual		     UMOUNT(8)

NAME
     umount -- unmount filesystems

SYNOPSIS
     umount [-fv] special | node
     umount -a | -A [-fv] [-h host] [-t	type]

DESCRIPTION
     The umount	command	calls the unmount(2) system call to remove a special
     device or the remote node (rhost:path) from the filesystem	tree at	the
     point node.  If either special or node are	not provided, the appropriate
     information is taken from the fstab(5) file.

     The options are as	follows:

     -a	     All the filesystems described in fstab(5) are unmounted.

     -A	     All the currently mounted filesystems except the root are un-
	     mounted.

     -f	     The filesystem is forcibly	unmounted.  Active special devices
	     continue to work, but all other files return errors if further
	     accesses are attempted.  The root filesystem cannot be forcibly
	     unmounted.

     -h	host
	     Only filesystems mounted from the specified host will be un-
	     mounted.  This option implies the -A option and, unless otherwise
	     specified with the	-t option, will	only unmount NFS filesystems.

     -t	type
	     Is	used to	indicate the actions should only be taken on filesys-
	     tems of the specified type.  More than one	type may be specified
	     in	a comma	separated list.	 The list of filesystem	types can be
	     prefixed with "no"	to specify the filesystem types	for which ac-
	     tion should not be	taken.	For example, the umount	command:

		   umount -a -t	nfs,mfs

	     umounts all filesystems of	the type NFS and MFS.

     -v	     Verbose, additional information is	printed	out as each filesystem
	     is	unmounted.

FILES
     /etc/fstab	 filesystem table

SEE ALSO
     unmount(2), fstab(5), mount(8)

BUGS
     When using	union filesystems, umount(8) cannot always determine the node
     which is the mountpoint.  In this case, it	is necessary to	specify	the
     relevant directory	to be unmounted	in the same form as that displayed by
     mount(8).	For example, given a mount entry like this:

	   <above>/tmpdir on /cdrom (local, user mount)

     then the command:

	   umount '<above>/tmpdir'

     would unmount /tmpdir from	the mountpoint /cdrom.

HISTORY
     A umount command appeared in Version 6 AT&T UNIX.

4th Berkeley Distribution	  May 8, 1995	     4th Berkeley Distribution

NAME | SYNOPSIS | DESCRIPTION | FILES | SEE ALSO | BUGS | HISTORY

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